Assignment for Week 2(2)

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Wilmington University *

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305

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Geology

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Feb 20, 2024

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docx

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2

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Assignment 2 SCI 305 “Give it some thought” questions on page 90 of the textbook. Complete #’s 3.) How does the rock cycle diagram—in particular, the labeled arrows—support the fact that sedimentary rocks are the most abundant rock type on Earth’s surface? The arrows in the rock cycle diagram demonstrate the dynamic nature of the Earth's processes, where rocks are constantly changing from one type to another. The emphasis on weathering, erosion, and the formation of sedi- mentary rocks in the cycle contributes to the understanding that sedimentary rocks are the most abundant type on the Earth's surface. 6 .) If you hiked to a mountain peak and found limestone at the top, what would that indicate about the likely geologic history of the rock there? Finding limestone at the top of a mountain peak suggests that the area was once under the sea. Over time, tectonic forces uplifted the region, expos- ing the marine sedimentary rock at the mountain's summit . 10.) (a, b, c, d) Examine the accompanying photos, which show the geology of the Grand Canyon. Notice that most of the walls of the canyon consist of layers of sedimentary rocks, but if you were to hike down into what is known as the Inner Gorge, you would encounter the Vishnu Schist, which is metamorphic rock. A.) What process might have been responsible for the formation of the Vishnu Schist? How does this process differ from the processes that formed the sedimen- tary rocks that are atop the Vishnu Schist? The process responsible would be the
pressure from metamorphism. The process is different from others because metamorphic is formed with heat and pressure underground whereas other processes include layering of different natural debris. B.) What does the Vishnu Schist tell you about the history of the Grand Canyon prior to the formation of the canyon itself? The Vishnu Schist tells us that the Grand Canyon was carved by the Colorado River and formed through the process of metamorphic. C.) Why is the Vishnu Schist visible at Earth’s surface? The Vishnu Schist is visible at the Earth’s surface because erosion exposed it by removing the sedimentary layers. D.) Is it likely that rocks similar to the Vishnu Schist exist elsewhere but are not ex- posed at Earth’s surface? Explain. Yes, it is likely. They are are probably found below the surface.
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